James tripp



(No Model.)

J. TRIPP. FEEDING MECHANISM FOR SEWING MACHINES.

No. 460,294. Patented Sept. 29, 189 1.

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UNITED STATES PATENT ()FFICE.

JAMES TRIPP, OF NEIV YORK, N. Y.

FEEDING MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent N 0. 460,294, dated September 29, 1891. Application filed January 12, 1891. Serial No. 377,442. (No model.)

To all whom it may concern..-

Be it known that I, JAMES TRIPP, aoitizen of the United States, residing at New York, in the county and State of New York, have invented certain new and useful Improvements in Sewing-Machines, of which the following is a description, reference being bad to the accompanying drawings.

The presentimprovement relates to the feedmotion mechanism of sewing-machines, pan ticularly to that part of such mechanism that gives reciprocating horizontal motion to the feed-bar; and the invention consists of improved means for adjusting the throw of the feed-bar.

I will first describe my particular features of improvement, and then point out in the claims to follow the description the combination of parts I consider as new and of my invention.

Figure 1 of the drawings is an elevation view of a sewing-machine bed-plate and needle-arm, parts of the bed-plate and standard being sectioned away to show the feed mechanism, the shuttle and needle operating mechanism being omitted. Fig. 2 is an elevation view of the same, in section on plane 00 ac, from the left of Fig. 1. Fig. 3 is a similar but modified view of the same parts, the base being omitted.

Referring to the views in detail, A is the base of the machine.

13 is the needle-arm, and O is the standard supporting the same on the base-plate.

D is the feed-bar, which is pivoted to the crank-arm E on the rock-shaft F, hung in lugs G from the bottom of the base-plate. At the other end of this rock-shaft is another crank-arm H, to which is pivoted the link I, through which the rock-shaft and feed-bar are operated from the main shaft J. These parts are in construction and form of the usual type.

K is a cam on the main shaft. L is a fork engaging this cam, and to this fork is pivoted at M the upper end of the link I. The lower end of this fork is pivoted at N to the block 0, which block is perforated and interiorly threaded and engages the screw shaft 1. This screw is mounted in bearings Q in the standard 0, so as to be capable of being turned, but has no movement lengthwise, and at one end is provided with the thumb-nut R.

The operation will now be plain. As the main shaft revolves the fork is vibrated on its pivotal support, and thereby pushes and pulls the link, which in turn oscillates the rock-shaft and causes the fe'echbar to reciprocate longitudinally. YVhen it is desired to alter the throw of the feed-bar, the screw P is turned, which causes the pivot N of the link L to change its position as to the pivot M of the link to the fork. This changes the angular relation of the lower end of the fork to the link, and correspondingly lessens or increases the movement imparted to the link by the fork. It is to be noted that the link is pivoted to the fork at a point above the pivotal support N of the fork, and that the fork is adjusted by moving this pivotal support laterally or to and from the link.

In Figs. 1 and 2 the pivotal support of the fork is shown as being arranged to move along a straight line. This, however, is not essential, as the adjustment of the lower end of the fork may as well be along a curved line and be effected by other means than by a screw. Fig. 3 illustrates such a modification. Here the. lower end of the fork is pivoted to the upright arm S of an angle-lever pivotally supported within the standard on a pin T, and having its other operating-arm U extending to without the standard, where it can be readily reached by the operator. .Moving this arm U upwardly or downwardly effects the lateral movement of the lower end of the fork, and thus lessens or increases the movement of the link L and the throw of the feed-bar. By these means I provide a simple and cheap mechanism for operating the feedbar of the sewing-machine, and by which the nicest adjustment of the bar may be quickly had and through any desired range.

hat is claimed as new is 1. The combination, in the feed mechanism of a sewing-machine, of the feed-bar, the rockshaft F, having crank-arms E and H pivotally attached, respectively, to the feed-bar and to the lower end of the link I, the main shaft J and cam K, and a fork L, engaging said cam and havinga laterally-moving pivotal support and being pivoted "to the upper end of the said link aboveits said support.

2. The combination, in the feed mechanism of asewing-machine, of the feed-bar, the rockshaftF, having crank-arms E and H pivotally attached, respectively, to the feed-bar and to the lower end of the link I, the main shaft J and cam K thereon, and a fork L, engaging 10 said cam and pivotally supported at its lower end on the block 0 and beingpivoted to the upper end of the link I at a point above its pivotal support, and a screw P, supported in the standard 0 and engaging said block 0 and adapted to move it to and from the said 15 link.

JAMES TRIPP.

Witnesses:

FRANK B. MURPHY, RoBT. F. GAYLORD. 

